ALLOY 800 / 800H / 800AT DATA SHEET

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1 ALLOY 800 / 800H / 800AT DATA SHEET UNS N08800 / UNS N08801 / UNS N08811 GENERAL PROPERTIES ////////////////////////////////////////////////////// //// 800 (UNS N08800), 800H (UNS N08810) and 800AT (UNS N08811) are nickeliron-chromium alloys designed to resist oxidation and carburization at elevated temperatures through F. The nickel content, 32 %, makes the alloys highly resistant both to chloride stress corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition, s 800H and 800AT have superior creep and stress rupture properties. All three versions of the basic 800 have been approved as materials of construction under ASME Boiler and Pressure Valve Code, Section I-Power Boilers, Section III-Nuclear Vessels, and Section VIII-Unfired Pressure Vessels. s 800, 800H and 800AT are identical except for the higher level of carbon (0.05 to 0.1 %) in 800H, and the addition of up to 1 % aluminum + titanium in 800AT. The 800 is normally used in this service at temperatures to approximately F (593 C). 800H and 800AT are normally used above approximately F (593 C) where resistance to creep and rupture is required. APPLICATIONS ////////////////////////////////////////////////////////////// //// Industrial Heating Industry radiant tubes, return bends, muffles, retorts and furnace fixtures //// Petrochemical furnace cracker tubes //// Hydrocarbon Processing Industry catalyst tubing, convection tubing, outlet manifolds and quenching system piping //// Power Generation Industry steam superheating tubing, high temperature heat exchangers STANDARDS //////////////////////////////////////////////////////////////// Product form Specifications ASTM ASME AMS EN / Werkstoff Plate sheet and Strip B409 SB / Smls Pipe and tubing B163 / B407 SB166 / SB / Welded Pipe and tubing B / Rod and Bar B408 SB / Forgings B564 SB / //// 800, 800H and 800AT alloys are assigned maximum allowable stresses in the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, Table UNF 23.2 up to F (816 C). These alloys are assigned maximum allowable stresses to higher temperatures than almost all other alloys covered in the ASME Code. Comparing the three alloys, 800H and 800AT are assigned higher maximum allowable stresses above F (649 C), and 800 is assigned higher maximum allowable stresses below F (593 C). This corresponds to the temperature range where short time tensile properties become less important design criteria than resistance to creep and stress rupture 1 / 6

2 Chemical composition (%) /////////////////////////////////////////////// C Mn P S Si Cr Ni Ti Al Al + Ti Cu Fe ASTM Grain size Not Specified 800H or coarsef 800AT or coarsef mechanical properties /////////////////////////////////////////////// //// typical properties of alloy 800 which was annealed at F (928 C) Temperature Yield Strength 0.2 % Offset Ultimate Tensile Strength Elongation F C psi MPa psi MPa % in 2" //// typical properties of alloy 800H and 800AT which was annealed at F (928 C) Temperature Yield Strength 0.2 % Offset Ultimate Tensile Strength Elongation F C psi MPa psi MPa % in 2" //// Short Time Elevated Temperature Properties //// The two tables above illustrate the short time high-temperature tensile properties f s 800, 800H and 800AT. The strength of s 800H and 800AT is lower because the heat treatment of s 800H and 800AT at F (1 149 C) results in a larger grain size to provide better creep and rupture stress rupture resistance. The F (982 C) anneal of 800 results in a finer grain size to provide better cold formability. 2 / 6

3 physical properties ///////////////////////////////////////////////////// Density Magnetic Permeability Specific Heat Melting Range lb / in 3 75 F (21 C) and 200 oersted 0.11 Btu / lb- F F = g / cm (15.9 ka / m) 460 J / kg- K C = Annealed = Hot Rolled = electrical and thermal properties //////////////////////////////////// Temperature Electrical Resistivity Thermal Conductivity Coefficient of Expansion a F C Ω circ mil / ft µω cm Btu.in / ft².h F W / m C 10-6 in / in / F mm / m / C a : Magnetic Permeability MOdulus of elasticity /////////////////////////////////////////////////// Temperature Tensile Modulus Shear Modulus Poisson's Ratio (µ) b F C 10 3 ksi GPa 10 3 ksi GPa English Metric b : Calculated from moduli of elasticity 3 / 6

4 corrosion resistance /////////////////////////////////////////////////// //// 800 is highly resistant, although not totally immune, to stress corrosion cracking. In extensive field experience, 800 has shown excellent service performance in many types of equipment in the petroleum, chemical, food, and pulp and paper industries. Thus, although 800 may offer a distinct advantage for use in moderately corrosive environments where service experience has indicated a tendency toward stress corrosion cracking of other austenitic stainless steels. However, the alloy is not immune to stress corrosion cracking as judged by the extremely severe magnesium chloride test. //// oxidation resistance //// s 800, 800H and 800AT are particularly well suited for high temperature applications such as furnace parts and related heating equipment, for petrochemical reforming units and isocracker tubes, and for handling superheated steam in nuclear and conventional power plants. With the specified high levels of chromium and nickel, the alloys offer superior resistance to oxidation and scaling, and to carburization as well. //// The following oxidation data for 800 were obtained by exposing samples to the indicated temperature for 100 hours in still air and cooling. In general, total weight gains greater than 10 mg / cm² indicate that additional exposure at these temperatures will lead to failure. //// Since oxidation rates are greatly affected by heating and cooling rates as well as by the atmospheres involved, these data can only be used as approximate guidelines. ////100 Hours Still Air Continuous Oxidation Tests Sample Weight Gain (mg / cm²) 1700 F 1700 F (927 C) (927 C) F (927 C) F (927 C) F (927 C) T309 Stainless Steel T310 Stainless Steel ////corrosion rates in refinery furnace atmosphere Corrosion Rate mpy mm / y 800H, 800AT T309 Stainless Steel T310 Stainless Steel T304 Stainless Steel Complete Oxidation Complete Oxidation 4 / 6

5 ////corrosion rates in refinery furnace atmosphere //// The high nickel content of s 800H and 800AT provided good resistance to carburizing environments. ////result of 100 hour gas-carburization tests in hydrogen + 2 % methane Weight Gain (mg/ cm²) 1700 F (925 C) 1800 F (980 C) H, 800AT T330 Stainless Steel ////results of gas-carburization tests at F (1 095 C) 25 hours tests in hydrogen + 2 % methane Weight Gain (mg/ cm²) H, 800AT 5.33 T310 Stainless Steel T309 Stainless Steel ////results of gas-carburization tests at F (1 095 C) 100 hours tests in hydrogen + 2 % methane & 5 % Argon Weight Gain (mg/ cm²) H, 800AT T330 Stainless Steel //// sulfidation //// Because of their high chromium content, s 800H and 800AT have good resistance to many sulfur-containing atmospheres at high temperatures. ////results of gas-carburization tests at F (1 095 C) 100 hours tests in hydrogen + 2 % methane & 5 % Argon Weight Loss (mg / cm²) 1100 F (600 C) 1290 F (700 C) H, 800AT T310 Stainless Steel T304 Stainless Steel / 6

6 //// nitriding //// Studies show that the resistance of nickel-iron-chromium alloys to nitriding increases with the increase of the nickel content. Although 600 (76 % nickel) is usually preferred for nitriding service, s 800H and 800AT (32 % nickel) still have good resistance to many nitriding atmospheres. //// results of nitriding tests at F (540 C) 3 years tests in 65 % hydrogen and 35 % nitrogen at 11 ksi (75.8 MPa) Depth of nitriding 1 Year 3 Years in. mm in. mm 800H, 800AT T310 Stainless Steel T309 Stainless Steel T446 Stainless Steel T304 Stainless Steel formability ////////////////////////////////////////////////////////////// ////, 800H, 800AT exhibit excellent cold forming characteristics normally associated with chromium-nickel stainless steels. The high nickel content prevents the austenite to martensite transformation which can occur when T301 or T304 stainless steel are cold worked. The alloys have a lower work hardening rate than T301 or T304 stainless steels and can be used in multiple draw forming operations where large amounts of deformation occur between anneals. //// As a consequence of the anneal cycle used on the 800H and 800AT alloys the large grain size produces a visibly undulated surface called orange peel after forming. heat treatment /////////////////////////////////////////////////////////// //// The anneal cycle conducted on 800 is typically in the F ( C) range. The purpose is to soften the material after forming operations while maintaining a relatively fine grain size. //// The heat treatment conducted on the 800H and 800AT alloys is typically in the range of F ( C). In addition to softening the material after forming operations, an additional purpose of this heat treatment is the development of larger grains for improved resistance to creep and rupture. welding /////////////////////////////////////////////////////////// //// The 800, 800H and 800AT alloys can be joined by tungsten arc (GTAW), gas consumable electrode (MIG), or by stick electrode welding techniques commonly used on stainless steels. A number of welding rods and wires are commercially available for joining the 800 series of alloys. Since these alloys form tightly adhering scales, which can be removed only be grinding, inert gas shielding is desirable. 6 / 6

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